Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fb77472c2b33d7…

MALICIOUS

PDF

35.7 KB Created: 2021-05-21 20:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6ac31e597d8de6e691a6d37b87567b9b SHA-1: 80ecce4b71dfc6c90952cc27b9af3eec237266e2 SHA-256: 39fb77472c2b33d73d99a4672b2c343c7643504e1795b71982b91a29d492bc0b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for a 'free generator / game hack' which redirects to a suspicious URL. The document body also contains explicit instructions to click a download link, consistent with social engineering tactics to trick users into visiting malicious sites. The primary URL identified is the most critical IOC.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/479516143/minecraft-free-download-mac-full-version-2021-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003009.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3009 25200 bytes
SHA-256: 62eb2277bbb787a1e10a595c3c71c2227a358ffb4979678479454b29cfa08a9f
font_01_sfnt_off00006834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6834 18964 bytes
SHA-256: b6087cd044d66512a4bbe462cbd4c424643b24317ccde57b4a21bed9d436f387

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